PCN Infrared Thermography Category 2 Practice Questions - BINDT PCN Infrared Thermography Category 2 (ISO 18436-7) Exam

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For an opaque body (transmissivity tau = 0) in thermal equilibrium, what is the mathematical relationship between emissivity (epsilon) and reflectivity (rho) under Kirchhoff's Law?

epsilon + rho = 1 epsilon * rho = 1 epsilon - rho = 0 epsilon / rho = 1

Correct Answer:

epsilon + rho = 1

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